US5329495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Passive beamformer with low side lobes
Assignee: United States Department of the Navy
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Filing: 1993-06-30
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Granted: 1994-07-12
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Expires: 2013-06-30
Abstract
Abstract A pulsed-transmission, narrow-band sonar system has a first antenna array ich is unshaded and a second array partitioned into four parts, the center two of which are electrically connected in parallel and the outer two of which are connected in series.
Inventors
- 👤 William J. Zehner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:40
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/34; G10K11/341; G10K11/348; Y; Y10; Y10S; Y10S367/00; Y10S367/905
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
68 words
Apparatus for reducing the effective side lobe level of a multi-element directional antenna system used to transmit and receive propagated signals comprising, a first array of elements having uniform shading and a second array of elements partitioned into a plurality of equal parts, the parts being electrically connected so that the second array is bizonally shaded, the second array being approximately 60 percent longer than the first array.
Claim 2
Dependent Claim
68 words
Apparatus for reducing the effective side lobe level of a multi-element directional antenna system used to transmit and receive propagated signals comprising, a first array of elements having uniform shading and a second array of elements partitioned into a plurality of equal parts, the parts being electrically connected so that the second array is bizonally shaded, the second array being approximately 60 percent longer than the first array.
Claim 3
Dependent Claim
20 words
Apparatus as set forth in claim 1 in which the center elements of the second array are connected in parallel.
References Cited (Backward Citations)
US4291396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-11 | 1998-01-10 | 1998-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-11 | 2002-01-10 | 2002-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-11 | 2006-01-10 | 2006-07-12 | $7700.00 | Window Closed / Lapsed |